2231999 has 24 divisors (see below), whose sum is σ = 2930256. Its totient is φ = 1680000.

The previous prime is 2231941. The next prime is 2232017. The reversal of 2231999 is 9991322.

2231999 = T₂₇₇ + T₂₇₈ + ... + T₃₂₅.

It is not a de Polignac number, because 2231999 - 2²⁰ = 1183423 is a prime.

It is a super-3 number, since 3×2231999³ = 33358248667604087997, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231909) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22049 + ... + 22149.

It is an arithmetic number, because the mean of its divisors is an integer number (122094).

2^2231999 is an apocalyptic number.

2231999 is a deficient number, since it is larger than the sum of its proper divisors (698257).

2231999 is a wasteful number, since it uses less digits than its factorization.

2231999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167 (or 160 counting only the distinct ones).

The product of its digits is 8748, while the sum is 35.

The square root of 2231999 is about 1493.9876170839. The cubic root of 2231999 is about 130.6866820246.

It can be divided in two parts, 223 and 1999, that added together give a palindrome (2222).

The spelling of 2231999 in words is "two million, two hundred thirty-one thousand, nine hundred ninety-nine".